Telephone system.



. H. WEBSTER.

TELEPHONE SYSTEM. APPLICATION mum JULY 27,1906.

Patented Aug; 24, 1909.

' UN rr-ED STATES;

PATENT OFFICE.

} HARRY G. wxns'rnn, or CHICAGO, ILLINOIS, Assumes 'ro mLo G. KELLOGG, or cmcxeo;

' .ILLINOIS.

ummrnom; SYSTEM;

Soeeificafion of Letters atent. Patented Aug. 24k, 190 9..

Application filed July 27', 190B. Serialiifo. 828,912.

To on whom it My concern;

Be itknown thatI, HA'KRX Winnie,

'a citizen of the United :Stetes, and'resident' of Chicago; county 'of-Gook, and 'Sta'teof-Illi nois, have'inwqented certain new and'us'eful Ina 'roven'ients' in Telephone Systexns, of

which the [following isa. specification.

My invention" relates to telephone ex'-- c-l'ian'g'e syl'sfiems and particularly to-that 'ty lJei inwhich k-conductors are interchangeab y associated with the subscribers lines, mechof the link-circuit: 3 Ofie objectof a'msni-being provided for each subscribersr line; which isuutomatically actuated'when.

the receiveris taken for use to connect the 'subscfibeflsi'line town idle link-circuit and cause the display of. a calling signal asso ciated-witli" amanually controlled terminalinvent-ion' ist'o provide, in a structure of this character, novel means for securing the-properyconnection and disconnection'of the subscribers line and the link-conductor inastructure characterized .by simplicityend economy. of manufactu're' and ositive and efficient operation. I

- .A urthe'r'obj ect o'f-my invention is to pro ,vi'de means whereby, duringthe time acalling signal is displayed in front of an operator,

no other idle'link-ci'rcuits at her positionwill be selected. This results in rendering-f the" operators position busy as long as she has an unanswered calling signal 'displayed at her a position.

In accordance with'my invention, 1 rm yitie'for 'each-subscriberS line atrave switch which is'preferdbl a rotary switc direction-"only; This switch is rotated fixed contactsad'apted for. engagement with the wipers, as; they" are rotated; and thefle ed contacts-are connectedwowires indi= wdplugsw th; variou 50 'fidual-to thevariouslink=conductorsr Theselink-conductors terminate preferably-in'cords o" erator's positions of 'e; multiple switchboarmiz the traveling fswitch' hanie' a normal 'ositioh" m which'they do not engage any oft contacts '-of the-switch, and when rotz'aited;

engage ptof era;bly,' first, the admin The . and? the 'sev'erfiilj lin'es are' provided with multizlvilejacksat the:

.varieus m'riultiple' sections; he wi ers of tion'; that those leading to the third opera tors position, and so on'; and these fixed contacts are miilti iv y con'nected'to similar switches" individua; to other subscribers linesiii a; gfo'up, 1 The other -link-circuits' terminating at the first, second} third and other operators" positiofis;-ma.y hesi'milarly connected to the rotating switches" of lines in other similar" groups; the arrangement 'being subll f thilt the link-conductor eon- 'nected to the first 'termixmlsof'a particular 'groupbf switches; and ternfinatingin'fro it' of the first operator at' the"switcl1'lioard,"be busyfthe'switcli step eiheadto the'seco'n'd terminalleadin'g'to a; second operator, and

when it wiilco'me to rest and the operation of associated mechanism ;will connect the. line liihbs to' the talking" conductors of the Jjnk circuit." Aththe same time, a call nifi signal, ass'ociete'djwitlithe link circuit, W be giisplayed; aniif after-ascertaining whet connection is" de'Sii'e'd,; the o ersst'or inserts the" pin i' ntotl1'en1 uItii$iejiic ofthe desired' line. efl cdnversat ofifis'fifiished','the re'-' movsfl of the connecting plugicauses a; fiirtlier rotation 'af the tores'tbre its wipers to theirnormalpc ition; v 7 Tos'ec'i'ire the proper operation. ofthespa dividua'i to the siibscri respect mysystem" differs fl'(')m 'otliers More P QP v -lie"called"a; c'ut o'fi relay, a.nd it's opera-"- tioii serves to connect the linelimbs to the wipers" ofthe' switch" wh'emtheibik circuit,

11. One of these relays" may selected. The other'relay," which may called. a: nine rela serves, among other =firnctions; to start and stbpftheti'aveling' the selection" and disconnev' I mechanis ecwawd the 'disj,

Each line is provided with a line relay 3 and V ,a cut-off rela the usual bell and condenser m a permanent bridge of the line limbs, the receiver 1" and .transmitter t being included'in a-normally 0 en bridge closed at the upper contact of t e switch-hook h. The limbs 1 and 2 we tend to the central office and are there connected to the terminals of a battery C.

4 and with a rotary switch S: This switch 1s actuated by a ,motor magnet L1 in response'to current from the pulsating generator G, the switch being diagrammatically indicated as having, a ratchet-wheel 5 carried on a shaft 6,Wl1i0h shaft also carries .with a local. or private circuit.

' contacts I),

the wipers a, b, c, the first two mentioned wipers being associated with limbs '1 and 2 respectively, and wiper 0 being associated Wiper a, when rotated by the operation of magnet M and ratchet-wheel 5, engages contact pieces a, a a jwi er 6 at the same time engages 5 and wiper cat the same time-engages contacts c',-c c ,'.in the order indicated, and other contact pieces correspondingly throughout the rotation. These contact pieces are multiply connected to corresponding contact pieces of other switches in 1 thesame' group of hnes, such another switch being indicated at S, all of the contact pieces -a, b and a being also connected to the wires of a link-circuit terminating in a cord and plug at the first operators position, the contact pieces a b 0 being connected to the wires of a link-circuit terminating at a second operators position, and soon through all of the contacts of the switch. Wipers a and b are indicated as having narrow terminals, and in rotating disen age one contact before engagin the next, w ile-wiper c has a wide termma and engages one contact before disengaging the previous one. The switch is also provided with contacts 10-11, whichare in engagement except when the switch is in, the normal positionthat of the diagrarm-Iand with contacts 1213 which are out of engagement except when the switch is mits normalposition.

When the subscriber desires to initiate a call, the removal of his receiver closes a circu'it whichmay be traced from the active terminal of battery C through winding 14 of relay 3, thence through contact '15 and resistance 24 at contact 25.

armature 16 of relay 1, through the line limbs and substation, then by wire 17 to contact 12 13 of the switch S and to ground through contact 18 and armature 19 of relay 4. This current operates relay 3, producing the following condition: The at-. traction of armature 20 disconnects wiper b from the sleeve side of the jack circuit at contact 21 and connects the sleeve contactol' the jack and the winding 23 of relay 4 to the active terminal' of the battery C, through The resistance v 24 is relatively high and serves to prevent the operation of relay 4 at this tine, while] providing the proper potential at sleeve contact 26 of the jacks to give a busy indication. The actuation of armature 91 disconnects limbf2 from wire 93 which leads through armature 46 and contact 47 of relay 4 to wiper a.. The actuation of armature 27 connects wlnding' 14 of relay 3 to the private wiperat contact 28, the resistance 29 being included in circuit between the wiper and contact. completes a circuit for motor magnet hi and generator G andrthe switch takes one step ahead. In its normal position, the winers of. the switch do not engage any of the fixed contacts thereon. As the first step is made, wipers a and b engage contacts a and b respectively; .but the wipers being at this time disconnected from the line limbs and from the central battery, no interierence' resultsin case the link-circuit corresponding to these contacts is in use for conversation.

The attraction of armature 3O I At the same time, wiper c engages contact 0,

contacts 10-11 of the switch come into engagement, and contacts 12-13 are disengaged. If the link-circuit corresponding to contact 0 be busy, contact '0 will be con nected to ground and the switch will con tinue in its travel until an idle link-circuit be reached, as will be subsequently described. Assunnng the link-circuit corresponding .to

c to be idle, no circuit will be completed through the engagement of the wiper c with the contact, as the wires leading from l the -contact 0, c c are open or disconnected from the central battery during the idle condition of the cord. This being the case it will be seen that the circuit energizing relay '3, previously traced, hasbeen inter-v rupted at contacts 12 13 of the switch by the resulting disconnection of limb 2 from the return side -of the battery or ground. Relay 8 is thus denergiz'ed, its contacts assume their normal position, the retraction of armature 30 interrupting the circuit of motor magnet hi and reventing the further rotation of the switc The retraction of armature 20, engaging 'contact21 connected to wi er b, closes, therefore, a circuit which may e traced as ,follows: from the active terminal of battery C, through winding 31 of relay and strand 33 of the. cord, and

aeand oontact a, strand48fa'nd the w' 35 through winding 34 of relay 32 at isjcircuaofsi li '1 through winding 34 of thesame relay, con: tact 35 and armature 36-0f relay 37, contact 38 and armature 39 of relay 40, and armature 39 of relay 40, and armature '41 and contact 42 of relay 32, and thence through relay 43 to the same strand 33.0f the cord circuit, thence to contact bflwiper b, contact- 2i and armature20' of-relay 3 and through winding 23 of relay 4 to the return side of the battery.

The windin s 31 and.34 beingat this time 111' multiple di erential relation and having a substantially equal number ofturns, relay 32 .remains unenergize'd, while cut-off relay. 4fis operated. W

The operationof relay 4.disconnects' limb 1 of.the line from winding 14 of relay 3 at the contact 15 andconnects it to 'the circuit just tracedat the contact 45, thus completing the circuit for the sleeve strand of the fizging. contact 47, completes the circuit of .6. limb 2, through wire 17 ,armature .91,

" contact 92,; Wire 93, armature 46, contact 47 and wirejfi7 to wiper a, contact a. and tip current will now flow from battery 0, through 4 thecircuit. (previously and substation and thence by wire 7, wipera dingof 'relay37 tothe return side of .theatte'ryl current energizes the substation transf-f. mitter and operates relay 37. The attraQ- the circuit the contact 335 and momentanly connects' strand 33 to groundrzthroughrelay 43, contact 42 and ar-' tion of armature. 36 interrupts mixture 41' of relay 32', armature 39 and contact138andarmature 36 and contact 44 of re- (40' 'lay37, a dthe resistance/of relay 43 will re-.

vent theretraction .of .armatures-lfi an "19 ofQrelay 4, in caserelay 32 operates slug- 1 at'this ti,lne. The attraction of arms. ture 49,.an'g 14 I icon-tactn50, completes.- a v p 51 which ma. .be traced from. the. active' terniinal .of attery C, throug'lltheflmgalfmature 49, contact 50,. rel 52,.contacu 53land.lever,.54of.the listen mg; ey]c-, and thencethrough contact-.55. and

'50 armature 56.;to' the returnside'of. the battery,

causing, the. illumination of the Iarnpand energizing relay .52, whichfisa common relay. randcontrols' the circuit of the pilot lamp 99.- =The' interru v.tion of. the circuit through e 55 3340 relay 32.allo ws thisrelayto by current; flowing; through wind-r The consequent-attraction of 'a'rma-' energized .ing 31, tpreAlat pontact 42 maintains the interruption. of the circuit through --wind ing .34 and relay .43. asgflongas the: relay remams-enerr gqed, and the. engagement of iarmature il. with" oontact. 57,. completes. an direct earth,

- connection. from private contact 0*, through contact 5.7,.ar'ma'ture 41, armature 3950f re.-

,dition of all idle cords wit Additional traced) of relay 32. and strand.- 33, through the two-line limbs.

into the es? f The actuation:

lay-:40, contact 38 and armature 3631M ;co'n-.

tact 44 of relay 37," andit isthe. presence of" an earth connectionto contact 0 which roduces the busy condition.ofthe-lirik-conductor. A further result hasbeem produced by the energizati'on of pilot relay 52. The

engagement of its armature 58and contact 59 causes the energization of relay 60 .Whlch is also common to the Relay GO-has a mu the armature 61 being connected to the nected to thecorrespondingjcontact or the second cord, the armature 63 to "the corresponding contact for the third. cord, an'dso nects these private contacts to'. ground through the resistances 64, 65 .-and- 66 re speotively; these resistances being so portionedthat the ground connection thus iplicityxof-contacts,

private contact c'ifor the first cord circuit of v the position, the armature .62 bein con-' on, anditheattractionof. the armatures,c0n-

secured will produce the rmgnred busy con j 'Withthe other operations of the structure;

.The result of this arrangement is that as .10 as the lamp 51 remains illuminated, all cor s'upon the operators osition-willbe in the busy conditlon and s e can. receive no .fiurther calls until, in answering that of out interfering lamp 51,. she depresses -her listening-keyk 1 and thus interrupts the circuitof-the, lamp and relay 52'at lever 54 and contact 53: The circuit is now in condition for the op-.

erator to communicate with the subscriber. .Learn-ing that subscriber B is desired, she

tests in the usual. way with the plug 0. It'

is :to be noted here that when-subscriber A his .swito-h,- his spring-jack contact. 26- was .initiatedthecall', and during the rotation of connected-.120 b'atte'ryfi throu h the high re sistance=24 to give ai busy in ication by the ng of re ay 3;

the circuit thIoughWinding-ZS- f relayAEha maintained the. necessary pot'entialtci ive --as at busy test'at the jack: contact 26 an be subse uently described, the necessary potentia .is- -maintained during processof disconnection while the sw1tch=.is 1

returning to normal.

. Assuming the lineo f subseriber Blobs idle, the operator inserts the-callingpl ,O

jack 7' and .actu'atesher ringingr ex 76. Current willnow flow from batteryQZ-f to .contact26 of the jack. andthro l1jtvi1;rd.---

ing 23 of. relay 4 tofthe return'si e -ofth'q,

battery, operating the relayand maintaine mg; its armatures-nattracted the; o

disconnects-limb.- 1- fronrrelay' 3; at; n.

tact.15','thu's preventing fanyf i- 7 ing switch assoclated. with lineiB.

relay 3 or consequent operation-o .f't-he 1 to contact .zeof theimzk i fliggressbirths-connection, and o m 45, while-the actuation v of 46;.

19 5. ement Of'armatuIe-ZO and. contacti2i Likewise, the establishmentlofi thence through armature 46 of relay 4, con

nects limb2 to contact 67 of the jack at contact 47 of relay 4. Ringing current is thus supplied to the line from generator G in the usual 1nanner.- Upon the restoration of the ringing-key, current will flow from battery C; through the winding of relay 40, the cord strand, plug. 0, contact 26, and winding 23 of-relay 4, thus maintaining the energiza tion of the relay andenergizing the relay 40.

The ensuing actuation of armature 39 of relay 4O substitutes a ground connection at contact 68 for that previously existing at :contact 44 of relay 37; the attraction oi." armature 56interrupts the-circuit of lamp 51 and relay 52 at'contact-55 so that the release of the listening-keydoes notcause the I subsequent illumination of lamp 51; and the actuation, of armature '69 disconnects the tip of the plug from the testing circuit to manner.

strand 70 at contact .71 in the'well known When the subscriber responds, additional current will flow through the relay 4,0, strand 72 of-the cord circuit,- contact 26 of the jack, contact 45 and armature 16 of' relay 4, the line limbs and substation,

' tact '47, jack contact 67 strand 70 and relay 73 to ground The initial attraction of armature 56, engaging contact 74 of relay 40, completed the circuit'of supervisory lamp 75 upon the restoration of the ringing-key, causing the illumination of the lamp and current," which flows through the substation and relay 73 when the subscriber responds,. energizes relay 73 to extinguish the lamp in the well known manner.

When subscriber B hangs up his receiver.

at the conclusion of conversation, the consequent denergization .of relay- 73 causes the v 40 illumination of lamp 75. Likewise, .the restoration of the receiver at station A a1- lows the retraction'of the armatures of relay 37 3 that of armature 49 causing the illumination of lamp 51 while that of armature 36,

which is-now in open circuit at contact 38,

produces no further result.- The illumination, of the two lamps constitutes the (lisconnect signal, and the operator removes the plug O,1thus denerg-izing the relay 4 and allowingitspontacts to return tonorr'nal, and denergizingrelay 40 to producea new circuit condition, it being borne in mind.

that relay 32Iis still energized by current.

. w flowing through its winding 31' and to thereturn side of the battery through the Wind- 'ing 23 of relay 4 of line A.. 'Armatures 56' andr'GQ assume their normal positions without further result, but the retraction of ararmature 39 connects battery to private consle'a'se. .--A,circuit may now be traced from" tact ac? to produce the condition of the rebattery C, through winding 34, contact 35,

armature 36,1contact 38, arma-tur'eSQ, armature 41 and contact 57 to contact of the s'witch5thence by. Wiper 0 through resistance nects winding 1.4 in serial relation with windreaches its normal 7 wipers reach their normal I circuits.

29, Winding 76 of relay 3, winding 77 of relay- 4, contacts '11 of the switch and contact;

78 and armature 19 of relay 4 to'thereturn side of the battery. This current serves to maintain the energization of relay 4 and to energize relay 3, but is of insufiicient strength to release relay 32 orreverse its polarity- The attraction ofarmature 27 of relay 3 coning 76 at contact 28, and current now flows "through the two windings, through winding 77 of relay 4, andccontacts 10-11 of vthe switch to the return side of the batte e contact 78 and armature 19 of relay 4, and-- this'circuit is'maintained until the switch 1 contacts 1011. e attractionf-o armaturn interrupts the circuit of relay 32; through winding23 of' relay '4 -at.' contact 21, and the engagement of armature 20 with contact provides the necessary potential at contact-26 'of.jack y to give ra'busy test during the process of release; 'l he attraction of armature now completes a circuit of motor magnet M and generator G,- which causes the switch to continuously rotate until relay 3 is denergized"b'y the disen-- 80'" position and se arates} gagement of contacts 10 and 11 when the During 1 of busy or idle link-conductors, and the presence. of resistance 29 in circuit with wiper a and wire 9 prevents the engage ment of wiper c witht 1 e contacts 0', 0 c of busy cords from short circuiting winding?? of relay 4, which, might result through the direct earth connectionof contacts 0, c 0? of such busy cords.

Referring again to the initial actuation of the switch which takes place in response-to the removal of-the receiver from the switchhook, it ch as been pointed out that if the cord circuit associated with a contact 0, 021: be'

idle, thewire leading from this contact will stand open at contact 57 of relay 32 and at armature 61 of relay 60, and the 1 switch would come to rest through the interruption of the circuit of winding 14 of relay 3. Wi er a is provided with a broad terminal an as the switch makes its first step, will engage contact 'cduringthe initial portion,

of the motion.- If the cord circuit associated with contact cbebusy; the .wire leading from this contact will be connected to ground through a resistance 64 of the common relay traced from battery 0 through winding 14 This being the case, a circuit may be either through armature 41 of its relay 32 .or

. tation engages contactc beforedisengaging contact a and if the cord circuit associated then act-mates her listening-key 32 is then energized by current 'A circuit may differential windings 3 l and 34] of re with contact a be busy, a similar circuit for. winding 14 of relay 3 is found and the switch.

-thus continues to. rotate until an idle cord circuit is reach ed.

1 ..In case limb l of the dentally grounded, it is'evident that the switch-- will. rotate without selecting an id-le link-conductor as longu'ralzs the accidental round is p' resent. If b2 becomes accientall-y; roiinded, the Frotation of the switchf'w' be started as soon as the subscriber attempts to make a call and will-con-' tinue until his receiver isreplaced, when the switch will then stop on the'contactsof the first idle linlbeircfiit encountered thereafter. then be traced from. the upper terminal of battery 0 as before, throu h the a 32 and throu h the strand 33 to wiper b and the winding 0 the cut-off relay, causing the at.-

traction of the cut-off relay but leaving relay. 32 inert. The circuit now being 0 en at the substation, no current can besupp ied to en-' ergize relay 37, and relay 32 therefore continues unenergized. The current flowing through winding 34, however, servesat this time to energize relay 43, causing the engageinent of its armature, and contact 98'-97 and.

the illumination of lamp 5L Theoperator as in answering a call, and observing thatlam 51 still remains lighted has an indication o 1 this accidental condition; she then established the regular releasing circuit by insertin her plug 0 into' thejack of any id e line an ately-with-drawing it. When the serted the energization of reIa'yAIO Interrupts the circuit through winding 34 and relay 43 at armature 39 and contact 38. The relay through its' winding 3], causing-armature 41 to engage contact 57 and when the plug is subsequently removed, the rengagement of armature 39 with contact 38 establishes the regular'releasing circuit previously described. If the subscriber inadvertently removes his receiver and immediately replace it, an idle link-circuit will be selected, and disconnected by the operator in a similar manner.

Vfhile I have described one arrangement of grouping the link-conductors or cord-circuits in their relation to the various switches.

and to the several operators position of a system, it is obvious that other Inethods'of groupingmay 'be'employedand I do not,

therefore, wish to be limited to the particular arrangement described. Neither, in thatline become acci feature of my invention which relates .to the means for making the link-circuits artificially busy, do I wishto be limited to a structure of the general character illustrated, as it is obvious that thisfeaturepf my invention may be embodied in other telephone exchange systems. It is also obvious that various-means may be em loyed for'causingthe rotation of the switc and its wipers; that the various groundsindicatedj maybe a common return and connected withthe grounded or return side of the central bate ;,that the battery C may be the same as attery O; and that various modifications and alterations of my invention may be made without departing from its-spirit.

What'I consider as new and novel and desire to rotect by Letters Patent- 0f the United tates.is:

1. A .tele hone exchange system comprisirt gla lura ty of telephone lines a plurality o 1 lugs, a subscribers line extendin in two im s from a substation to the exe ange, a source of current for the line, signal indicators for the link-ciicuits, a traveling switch for the line operated by a motor magnet and a sourceof current, fixed contacts for said switch constituti terminals of ,line and local conductorso said link-circuits, a line relay normally connected in circuit with the line limbs, line and local wipers for said switch, 7 sair local wiper being connected with-a win ing'ofthe line relay, and said wipers engaging said fixed contacts when the switch is operated, and a cut-off relay operating when energized to interruptthe normal circuit of the line limbs and of the line relay. w

2. A telephone exchange system comprising a lurahty of telephone lines, a plurality of lin -circu1ts terminating in connecting -circu1ts terminating in connecting I plugs, a' subscribers line extending in two s--from a substation to the exchange, a source of current for the line, signal 1I 1(i1 cators for the link-circuits, a traveling switch for the line operated by a motor magnet and a source of current, fixed contacts for said switch constitutmg terminals of line and local conductors of said link-circuits, a line relay normally connected in circuit with the .line liIn-bs,'li11e wipers for said switch connected to the line limbs when the line relay is inert and a" local wi er connectedwith a winding 'of the line re ay, said wipers engag ing said fixed contacts when the switch 1s 0p erated, and a cut-off relay operating when.

energized to interrupt the normal circuit of the line limbs and of the line relay.

3. A telephone exchange system comprising a lurahty of telephone lines, a plurality of linlr-cireuits terminating in conneetmg plugs at a plurality of operatorsf positions, a subscribersline extending in two limbs from a substation to the exchange, a source of ourrent for the line, signal indicatorsfor the linkated, and a cut-off relay operating when energized to interrupt the normal circuit .of the me limbs and of the line relay. I 4. A telephone exchange system comprising av lurallty of telephone hnes, a plurality of lin -circ1iits terminating in connecting plugs at a plurality of operators positions, a subscribersline extending in two limbs from a'substation to the exchange, a source-of current for the line, signal indicators for the linkcircuits, a traveling switch for the line opers ated by amotorma net and a source of current, fixed contacts or said switch constituting terminals'of line and local conductors of said link-circuits, a line relay normally connected in circuit with the line limbs, line wipers for said switch'connected to the line .limbs when the line relay is inert and a local wiper connected with a winding of the linerelay, said wipers engaging said fixed contactswhen the switch is operated, and a cutoff relay operating when energized to interrupt the normal circuit of the me limbs and of the line relay.

5. A telephone exchange system comprising a pllurality of telephone lines, a plurality of lin -circu1ts terminating in connecting plugs, a subscribers line extendin in two limbs from a substation to the axe ange, a source of current for the line,- signal cators for the link-circuits, a traveling switch for the line operated by a motor magnet and a source of current, fixed contacts for said switch constituting terminals of line and local conductors of said link-circuits, a line relay, line and local wipers for said switch engaging said fixed contacts when the switch is operated, a cut-off relay operating when energized to interrupt the normal circuit of the line limbs and of the line relay, and. a local" -winding for the line relay in a circuit controlled at one point by the cut-ofi' relay and at another point by t e local wiper.

6. A telephone exchange system comprising a plurality of telephone lines, a-plurality of link-circuits terminating in connecting plugs, a subscribersline extendin in two limbs from a substation to the exc ange, a

caters for. the link-circuits, a traveling switch for the line operated by a motor magnet and asource of current, fixed contacts for said switch constitutin terminals of line :and local-conductors 0 said link-circuits, a line al. indirelay, switch contacts of the line relay in circuit with the windin of the motor magnet and o crating when t 1e relay is energized to comp etc the. circuit of the motor magnet and source of current, a cut-off relay operating when energized to interrupt the normal circuit of the line limbs and of the line relay,

cuit controlled at one point. by the cut-off relay and at another point by the local wiper.

7. A tele hone exchange system comprising a lura ity of telephone lines, a plurality of lin -circuits terminating in connecting lugs, a subscribers line extending in two imbs from a substation to the exchange, a source of current for the line, signal indicators for the link-circuits, a traveling switch and a local winding for the line relay in a cirfor the line operated by a motor magnet and a source of current, fixed contacts for said switch constituting teimlnals .of line and local conductors of said link-circuits, a line' relay normally connected in circuit with the line limbs, line and local wipers for said switch engaging said fixed contactswhen the switch is operated, a cut-off relay operating when energized to interrupt the normal circuit of the line limbs and of the line relay,

and a local winding for the line relay in a cir- "cuit controlled at one point by the cut-off relay and at another point by the local wiper. 8. A telephone exchange system co1nprising a urality oftelephone lines, a plurality of lin -circuits-term1nating in connecting lugs, a ,subscrlbers line extending. in two s from a-substation to the exchange, a source of current for the line, slgnal 1nd1cators for the linkcircuits, a traveling switch for the line operated by a motor magnet and a'source of current, fixed contacts forsaid switch constituting terminals of line and local conductors of said linlccircuits, a line relay normally connected-in circuit with the line limbs, switch contacts'of the line relay in circuit with the winding of the motor magnet and operating when the relay is'energized to complete the circuit of the motor magnet and source of current, a'cut-ofi relay operating when energized to interruptthe normal circuit of the line limbs and of the line relay,

and a lpcal'windi'ng for the line relay in a circuit controlled at one point by the cut-off re lay and at another po nt {by the local wiper.

9. A telephone exchange systenrcomprising a lurality of telephone lines, a plurality of lin -circu1ts terminating in connecting plugs, 'a subscribers line extendin in two imbs froin'a substation to the exc ange, a source of current for the line, signal indicators for the linkcircuits, a' traveling switch forthe line operated b a motor magnet and a source 'of'current,, xed contacts for said switch constitutin' terminals of line and local conductors 0 said link-circuits, a line relay, switch contacts of the line relay circuit with the winding of the motor -magnet "cuit with the windin comp etc the circuit of the motor magnet and vposition.

' oflin 435 source ofcurrent for the line, signal in icarelay, switch contacts of the line relay in circuit ofthe line limbs and of the "line, relay,

.for' the line operatedby a motor magnet and;

a source of current, fixed contacts for said '0 switch constituting terminals .of line and l local conductors of said link-circuits, a-line cuit of the line limbs and of the line relay, a

ing when energized to interrupt the normal circuit of the line limbs and of'the line relay, 1' and a local winding for the line relay in a circuit completed at the time of disconnection whereby said line relay is energized.

10. A telephone exchange system c ompris ing a lurality of telephone lines, a plurality of". lin -circu1ts terminating in connecting lugs, subscribers, line extending in two ilnbs from a substation to the exchange, a source of current for the line, signal indica-' tors for the link-circuits, a traveling switch for the line operated bya motor-magnet and a. source of current, fixed contacts for said switch constitutin terminals of line and local conductors 0 said link-circuits, a line of the motor magnet and o erating'when t e relay isenergized to source of current, a cut-off relay operating when energized-to interrupt the normal cirand' a. local winding for the cut-off relay in a circuit completed at the time of disconnection whereby the energiz'ation ofthe relay is maintained until the switch is in its normal cuit with the windin 11. A telephone'exchange system compris-' ing a lurality of telephone lines, a plurality *OiI'CUllJS terminating in connecting. lu s,- a subscribers line extendin in two imlis' from a substation to the exc ian e, a.

tors for the link-circuits, a traveling switch relay,"switch contacts of the line relay in cirof themotor magnet and g erating when t e relay is energized to comp etc the circuitof the -motor magnet'andi source of current," acut-o'fli relay operatingwhenenergized to interrupt the normal 0i!'- local winding for the .line relayin acircuit, completed 'atthe time of disconnection whereby said line rclayis energized, and a local wmding'for the cut-off relay in a circuit completed. at the time of disconnection whereby othe energization of the relays is maintained until theswitch is in' its normal position. v I v 12 A telephone exchange. system compris- .of; link-circuits terminating in connecting a source of current, fixed contactsfor said switch constituting terminals of line and local conductors of said link-circuits, a line relay, switch contact-s of the line' relay in circuit with the winding of the motor magnet,

and o )eratin when the rela is ener ized to 1 g y g comp ete thecircuit of the motor magnet and source of current 'a cut-off relay operating when energized to interrupt the normal cir' cuit of the line'limbs and-of'the line relay, and a locking circuit for theline and cutofl' relays com letedthrough the conjoint energization 0 said relays and interruptedby contacts of theswitch when it is'in itsnormal position. I a i.

,1 3. A telephone exchange system comprising a plurality of telephone'lines, a plurality of link-circuits terminating in connecting plugs, 11 'subscribers line extendin in two imbs from a'substationito the exc a e, a source of current for the line, signal in jeators for the link-circuits, atraveling switch for the line operated'b -a motor magnet. and a source of current, fixed contacts for said switch constituting terminals of line and lo- I cal conductors of saidlink-circuits, a. line relay, switch contacts of the line relayin cirof. the motor-magnet and o crating when the relay is energized to compl te the circuit, of the motor magnet and source of current,- a cut-off relay operating when energized to interrupt the normal circuit of the line limbs and of. the line relay,- and local windings for the line and cut-ofl relays in a circuitft-hrough their conjoint energliization and only interrupted by contacts of t e switch when it is in its normal position. 14. A telephone exchange system comprising a luralityof telephone lines, a plurality f hull-circu ts terminating in;,connecting {)1u%s,"a subscribers line exten'din in; s from a substation to the exc an 'e, a source of current for the line, signal indicatorsfor-the link-circuits, a traveling switch for the line operated by a motor magnet and g a source of current, fixed"contactsfor said in two switch .constitutingterminals of line and local conductors of 'saidlink-circuits,a line relay, switch contacts of the line relay in 'circuit with the windin of the motor magnet and olperating when t e relay is energized to. comp etc the circuit of the motor magnet and source of current, a cut-off relay operating when energized to interrupt the normal circuit of theline limbs and. of the line relay, and locking windings for the line and cut-oil -r elays'in a circuit completed through their conjoint. cnergization and only interrupted mal position.

1? ing aplurality of telephone lines, a plurality by contacts of the switch when it is in its norl Plugs, a s'ubscrihers line exten'din in two imbs from a substation to the exc hange', a source of current for the line, signal'indicators for the link-circuits,-Va traveling switch for the line operated by a motor magnet and 15. A telephone exchange system comprising a plurality of telephone lines, a plurality of link-circuits terminating in connecting lugs, a. subscribers line extending in two imbs from a substation to the exchange, a

source of current for the line, signal indicators for the link-circuits, a pair'of relays'for link-circuit relay will'not be energized until the last-mentioned link-circuit relay is opeach link-circuit, a source of current associated therewith, and a neutralizing winding for one of 'said'link-circuit relays in a cir cuit controlled b the other of said link-cir-. cuit relays where v y, when both of said relays are included in circuit, the first-mentioned erated. I I I 16. A telephone exchange system comprising a plurality of telephone lines, a plurality of link-circuits. terminating in connecting plugs, a subscribers line extending in two ]II1bS from a substation to the exchange, a

source of current for the line, signal indicators for the link-circuits, traveling switch for the line operated by a motor magnet and a source of current, fixed contacts forsaid switch constituting terminals of line and local conductors of said link-clrcuits, a line relay, line and local wipers for said switch engaging said fixed contacts when the switch is operated, a cut-off relay operating when energized to interrupt the normal circuit of the line limbs'and of the line relay, a pair of relays for each link-circuit, a source of current associated therewith, and a neutralizing winding for one of said link-circuit relays" in a circuit controlled by thefother'of said link-circuit relays whereby, when both of said relays are included in circuit, the first-mentioned normal upon the energization of both ofsaid link-circuit relay will not be energized until the last-mentioned link-circuit relay is, operated. 1 i

" 17. A telephone exchange system com-- prising a lurality of telephone lines, a plurality of ink-circuits, automatic switching means for'establishing connection between a calling line and an idle link-circuit, a con-' trolling relay for said switching means nor.

mally under the control ,of the calling party, a cut-off relay, and means for restoring said switching means to 'normal upon the encrgization ofboth ofsaid relays.

IS. A telephone exchange system comprising a' plurality of telephone lines, a plurality of llnk circuits terminating in-nianual connection terminals, cooperating connection terminals adapted" to be connected thereto, automatic switching means for establishing connection between a calling line and an idle link-circuit, a controlling relay l for said switching means normally under the control of the calling party, a cut-off relay,

means for restoring said switching means to relays, and meansresponsive to the disconnection of said. manual connection terminal for causing the simultaneous energization of said relays.

19. A telephone exchange system comprising a plurality of telephone lines, a plurality of link-circuits, signal indicators for the link-circuits, automatic switching means for establishing connection between a calling line and an idle link-circuit, a controlling re.- lay for said switching means normally under the control of the calling party, means for ac tu ating the appropriate-signal indicatorupon the establishment of such connection, a cut oif relay, and means for l. restoring said lishing connection between a calling-line and an idle link-circuit, a controllingrelay for said switching means normally under the control of the calling party, means for actuating the a ro )riate si nal indicator u on 7 Fl 1 g P the establis ment of such connection, acutofl relay, means for restoring said switching means to normal upon the energization of both of said relays, and means responsive to; the disconnection of said manual connection terminal for; causing the simultaneous ener gization of said relays. a 1 I 21. A telephone exchange system cor nprising a plurality of telephone lines, a plurality of link-circuits terminating in manual connection terminals, cooperatingfconnetition terminals adapted to. beconnected I thereto, automatic switching means for es;- tablishing connection between a calling line and an idle link-circuit, a controlling rel'a'y .for said switching means normally under the control of the calling party, means for dis- 7 playing a signal upon the establishmentof placing said signal under the calling substa-. tion control upon theconnection of the manual terminal to its cooperating terminal, a

second signal -ing"means' placed under the called substation control by said connection and means for rrxatoring said switchingmeans to'normal apon'the energization of both of said relays.

22. A telephone exchange system comprising a plurality of telephone lines, a plurality of link-circuits terminatingin manual connection terminals, cooperating connec tion terminals adapted to be connected thereto, automatic switching means for es tablishing connection between a calling line and an idle link-circuit, a controlling relay for said switching means normally under the control of the calling plarty, means for displaying a signal upon e establishment of, such connection, a cut-ofi' relay, means for placing said signal under .the calling substation control upon the connection of the manual terminal .to its cooperating terminaha second signaling means placed under the "such connection, a cut-ofi relay, means for called substation control by said connection, means for restoring said switching means to normal upon the energization of both of said relays, and means responsive to the disconnection of said manual terminal for causing the simultaneous energization of said relays.

23. A telephone exchange system comprising 'a lurality'of telephone lines, a plu- 0 rality of ink-circuits extending to different operators positions at the exchange, auto-' matic switchin neans for establishing connection between a calling line and an idle one of said link; ircuits, and means respon-' sive to the establishment of such connection to renderall other link-circuits at the particular operators .position artificially busy.

24. A teleph ne exchange system comprising a lura ty of telephone lines, a plul y n? operators positions at the exchange, automatic switchingmeans for establishing connection between a calling line and an 'idle one of said link-circuits, means responsive .to the establishment of such connectlon to render all other link-circuits at the particular.

upon the inclusionof said set in circuit With said link-circuit to remove said busy condition. v

' 26. A telephone exchange s stem comprising a lplurality of telephone ines, a-plurality of nk-circuits extending to different operators positions at the exchange, automatic switching means for establishing connection between a calling line and an idle one of said link-circuits, and automatic means for rendering all other link-circuits at the particular operators position artificially bus ' v271A telephone exchange 5 stem 'comprising a lurality of tele hon'e' ines -a' 111- rality of link-circuits ext nding to difiei ent operators positions at the exchange, automatic switching means for establishing con- ,nection between a callingline and an. idle one of said link-circuits, automatic {means for rendering all other link-circuit's-lat the particular I operators position artificially usy, and means amder'thecontrol of the "operator for removing said busy condition. 4'55 28,. A telephone exchange system: comnk-circuits extending to differentsaid circuit. a

ralit'y o prising a plurality of telephone lines, a plurality of link-circuits, an automatic switch having traveling contacts for establishing connection between a calling line and an idle link-circuit, a controlling relay for said switch, means under the' control of the subscriber .for energizing said relay to cause said switch to beginits "operation, means for maintaining said relay energized to cause said switch to continue its operation until an idle link-circuit is, encountered, means under the control of the operator to complete a circuit including a travelin contact of said switch and. a winding of sai relay to again energize said relay and thereby again 30 set said switch in operation, and means for maintaining said rela energized until said switch reaches normal 29. A telephone exchange systemcomprising a lurality of telephone lines, a plu- 35 rality; oflink-circuits, an automatic switch having traveling contacts forestablishing connection between a calling line and an idle link-circuit, a controlling relay for said switch, means under the control of the sub 0 scriber for initially energizing said relay to cause said switch to begin its operation, a maintaining circuit forvsaid relay including one of the aforesaid traveling contacts, means, for interrupting said circuit when an.95 idle link-circuitis encountered, means under the control of the operator to again complete ascircuit including a travelin contact of said switch and a windin of sai relay to again initially energize sai set said switch in operation, a maintain n circuit for said relay established upon sai latter energization, and means responsivev to the movements of said switch for controlling.

' 105. .30. A telephoneeXchange s stem comprising a plurality of telephone ines, a pluf ink-circuits, an automatic swltch' having traveling contacts for; establishing connection between a calling line and an idle 11 0 link-circuit, 'a controlling relay for said switch, means under the control'of the subscriber for initially energizing said relay to cause said switch to begin its operation, a maintaining circuit for said relay including one of the aforesaid traveling contacts,

means for interrupting said circuit when an idle link-circuit is encountered, -means under 7 thecontrol of the operator-to again com lete 1 a circuit including a' travelin contact 0 said switch'and a wind-in kofsai relay to again initially energize sai {relay to=aga1n set said switch in operation, a maintaining c'ircuit for'said relay established upon saichlatter energizatioig-and mean'sjor interrupting said maintaining'isirc'uit when said switch neaches I normal.

31. A telephone exchange Q's stem coniprisinga plurality of telephone ines, a plurality of associated link-circuits, automatic HQ.-

relay to again 100 said locking switching means for establishing connection between a calling line and an idle link-circuit,

a pair of relays associated with the selected link-circuit and having windings in circuit with the talking strands thereof, and neutralizing means acting on one of said relays and controlled by the other.

32. A telephone exchange system comprising a plurality of telephone lines, a plu-' rality of associated link-circuits, automatic switching means for establishing connection between a calling line and an idle link-circuit,

a pair of relays associated with the'selected link-circuit and having windings in circuit with the talking strands thereof, and a neutralizing winding on one of said relays in a circuit controlled by the other.

33. A telephone exchange system com prising a plurality of telephone lines, aplurality of associated link-circuits, automatic switc ing means for establishing connection between a calling line and an idle link-circuit, a pair of relays associated with the an swering end of each link-circuit, and means of the other of said relays is dependent upon the condition of the 'first relay.

35. A telephone exchange system com prising a lurality of telephone lines, a-plurality of, ink-circuits, automatic switching means for establishing connection between a calling line and an idle link-circuit, a pair of controlling relays, one, of which is normally in circuit with a calling line,'means for completing acircuit through winding's'of both relays to cause a restoration of the switching means to normal, a locking-circuit therefor,

and means associated with :said switching means to interrupt said locking-circuit when the switching means reaches normal.

36. A telephone exchange system comprising a lurality of telephone lines, a'lplurality. of ink-circuits, automatic sw-itc ing means for esta'blishin connection betweenacallingline and an. 1 e link-circuit, a palr of controlling relays, one'.of which is 'a-cut-ofl relay, meansjfor' corn leting a circuit through windings of both. re ays to cause a restorae tion-ofi the switching means to normal, a"

locking circuit therefor, and -means' associ ated, with said switching to interrupt circuit when, the switching means reaches normal.

phone line, link-circuits at'theexchange, a selective switch: for said-line {or actuation to,

37. A telephone exchange system coniprising a plurality of telephone lines, a group of signal indicators therefor, means operated over the lines for variously associating said lines and indicators and causing the display of the latter, and means operated during the display of any one indicator to prevent the display of any other indicator in the group.

3 8.A telephone exchange system com prising a plurality of telephone lines, a group of signal indicators therefor, 'means operated over the lines for variously associatingsaid lines and indicators and causing the display of the latter, and 'connections go rendering the other indicators inoperable while one is displayed. I

39. A telephone system including a telehone line, a line 'relay therefor, a cut ofi' 'reay for operation to disconnect said line relay '35 from the line, and means for simultaneously 7 closing a series circuit energizing said relaysincluding a central source of current.

.40. A telephone system including a telephone li ne, a line relay therefor, a cut-off relay for operation to disconnect said line relay from the line'and operators means for simultaneously closing a series circuit energizing said relays includ ng a-central source of current.

41. A telephone system including a telephone line, link-circuits at the exchange, a

selective switch for said line for actuation to v automatically select and connect said line with an idle link-circuit, a line relay havin a 10G winding normally in circuit with said line for actuation res onsive to current thereover to. initiate trave of said switch, a cut-off relay for actuation on selection made to disconnect said winding, a second winding for said' line relay, and means controlled by the operator for energizing said second winding to restore said switch to normal.

42. A telephone system including a telephone line, link-circuits at the exchange, a 1 selective switch for said-line for actuation to automatically select and connect said'line with an idle link-circuit, a line relay having a. winding'normally in circuit with said line for actuation-responsive to current thre- 1 over to initiate travel of fsaid'switch, a cutoff relay foractuation on selection made to disconnect said winding, a second winding for said. linerelay, means controlled by the operator for 'energizingsaid second-winding 1 to restore'said switc h' to normal, and a conergized while said switch is'restori-ng. 43. A tel'ephonesystem including a'teleautomatically, select and connect said. line with an idle link-circuit, a linerelay hav ng a winding normally in circuit with said line.

for actuation responsive to current the-21 13" for said line relay, means controlled by the selective switch for saidline for actuation tooperator for energizing said secondwinding to restore said switch to normal, and a lockmg contact for said relay thereon. effective to continue its energization while said switch is restoring.

44. Atelephone system including a tele phone line, link-circuits at'the exchange, a

selective switch for said li-nevl'or actuation. to automatically select andconnect said line with an idle link-circuit, a line relay having a winding normally in circuit with said line for" actuation responsive to current there- 'over to initiate travel of said switch, a cutofl relay for actuation on selection made to disconnect saidwinding, a second winding fox-said line relay, means controlled by the operator for energizing said second winding to restore said switch'to normal, a locking contact for said relay thereon effective to continue its energization whilesaid switch 'is restoring, and an off-normal contact opened when the switch is restored to dencrgize said relay.

45. .A telephone system including a telephone line, link-circuits at the exchange, a

selective switch for said line for actuation to automatically select and connect "said line with an idle. link-circuit, a line relay having a winding normally in circuit with said line for actuation responsive to current thereover to initiate travel of said switch, a cutoff relay for actuation on'selection made to disconnect said winding, 3. second winding for said line relay, means controlled by the operator for initially energizing said second winding, a. locking contact for said relay thereon effective to continue its energization while said switch is restoring, and a connection for continuing said cut-ofi' relay energized while said switch is restoring.

46. A telephone system including a telephone line, link-circuits at the exchange, a

automatically select and connect said line with an idle link-circuit, a line relay'having a winding normally in. circuit with said line for actuation responsive to current thereover to initiate travel of said switch, a cutofi relay for actuation on selection made to disconnect said winding, 8. second winding for said line relay, means controlled by the operator for initially energizing said second winding, a locking contact for said relay thereon effective to continue its energizas tion while said switch is restoring, an offnormal contact opened when the switch is restored to deenergize said relay, and aconnection for continuing said cut-bfl relay energized whilesaid switch is restoring.

I '47( Atelephone system includin a telephone'line, l1nk'0lTClllt/S at the eirc image, a

' automaticall selective switch for said line for actuation to automaticall select and connect said line with an idle ink-circuit, a line relay having a Winding normally in circuit with said line for actuation res onsive to current thereover toinitiate travel of said six itch,- -acut-oil relay for actuation on selection made to disconnect said winding, a second winding for said line relay, a circuit controlled by the operator for energizing said second winding in series with said cut-oii' relay to restore said switch, and means for continuing said relays energized independently of. the operator *5 M10. the switch is restoring; 7 i

48; A tele hone system including a telephone line, ink-circuits at the exchange, 'a selective switch for said'line for actuation to automatically select and connect said line with an idle link-circuit,a linerelay having a winding normally in circuit with said line. for s5 actuation res onsive to currcnt-thereover to initiate trave of said switch, a cut-oil relay for actuation on selection made to'disconnect said winding, a second winding for said. line relay, a circuit controlled by the operator for energizing said second winding in'series \w ith' said cut-off relay to restore said snitch, means for continuing. said relays energized independently of the operator while the switchis. restoring, and an off-Fiorrnal con tact actuated on restoration of said so. itch to deenergize said relays.

49. A telephone system includinga telephone line, link-circuits. at the exchange, a selective switcl'i for said line for actuation to 100 select and connect said line; withan idle ink-circuit, a line relay having a winding normally in circuit \a'ith said line for actuation res onsive to current thereover' to initi'ate trave of said switch, a cutoi'l relay 105 for actuation on selection made to disconnect said winding, a s.c.cond;winding for said line relay, and a circuit controlled by the operator for ener izing said second Winding in series with sai cut-off relay to restore said itch.

50. A telephone system includi n a telephone line, link-circuits at the exc ange, a SGlGCtlVBSfi-fltGh for said line for actuation to 'autoinaticallvfselect' and connect said line said winding, a second'winding for said line-L20 relay, and means controlled by the operator for effecting a simultaneous 'cnergizatlon of said windings to restore said snatch to normal. I i

51. A telephone system including a 916; l25

phone line, link circuits kit-the exchange, a

selective switchfor said line'for actuation to automatically select and connect said lire I with an idlelink-ciriwuit, a line relay having a p winding normally in circuit v. ith said line for 1.30

\ i v p I actuationres onsive to currentlthereovento initiate trave 'of said switch, a cut-E relay for actuation on selection made to disconnect I said winding, a second winding forsaidrelay', means controlled by the operatorfor initially energizing saidsecondewinding, and a? locking contact efl'ectiveonly when said sec- .1 0nd winding is energizedfto dontinuesaid- 're- 'layener'gized. v v p '0 52. A tele hone system incl u din sja tele phone line, Yank-circuits at" thefexc angs f-a selective switch for said line foractuation automaticall selectand tonne-Cas ia" lin -with an idle 'nk-ciicflit, alin-e relay ha fn'gsa or wind.ing normally in circuitwithsaidline actuation res onsive to current there-over, to;

} initiate"trave ofsaidfswitch; a. cut-off relay for actuationbn-selction made to disconnect said-'wln'ding, a second winding for said-. re'-1* o "lay, meanscontrolled'by the-operator for'ini' tiallj energizing said second winding, a l'ock-a :i-ng contact effective only when said second -wind.ing-is-'energized to continuesaid relay)- energized; and a switch automatically-shift-' ed 'o'nTeQtOrat'iOn of'said selective switch to deenergizesaid relay;

'53. -A telephone system includin phone line lmk-circuits at the axe an'ge; a

v selective-' switch for line for-actuation b" automatically select and connect said' line dle-{iink-circuit, a liue'relay having h an a normally-in circuit witlli'said line for actu'a i0 '5 011' relay for actuation on selection made' to disconnect said Winding, a locking'circuit'for" said line l'elay including an armature switchthereof, -a'normall y open switch- 'oontaet of said cut-off relay included in said-circuit for;

for-actuation responsive to current thereover -to initiate travel of said switch,a out-off relay for actuation on selection 'made to disconnect, said winding, a locking circ'uitfor said line relay includlng an armature switch thereof, a normally open switch; contact 'of said-cut-ofi relay included in said circuit for closure on actuation of said relay; an ofi normal. contact of said 'selectiver- 'switch included in sa dcn'cuit ifor closure, on initial movement ofhsald-o swltch, and means conj-i trolled by the operator forfinally' efie'cting completion of said iocking circuitjto restore 'saiclselective switchlff 1 .fii A tele hone systeminqludin tele- 5 phonefliney mk circuits at the axe a'nge, a

selective switch forsaid line for actuatidn'to {automatically 'select 'and connect said line withan. idle link-circuit, ..a line relay having fdr' actnation' responsive to current therelay a locking circuit for said' line relay an armature switch thereof, a 5 alliy o1 nswitc'h contact of said cut-off relay'inclu gd in said-circuit for closureon -actuation of said "relay, an ofi-normal contaet ofsaid-selectiveswitch included in said for finallyefiecting completion of said lockingy-circ'uit to restore said selective switch, gal mean's'for automatically opening said circuit,'onc'restoration of said switch.

i a 516. A te'lephonelsystem includin a telephone line; link-circuits at the e'xc ange, a selective 'switchfor said line for actuation to '-automat'ically select and connect said line with an idle link-circuit, a line relay having awindingnormally circuit with said line fort-actuation-responsive to current there- Ofi:r618,y a locking circuit for said line relay includingan armature switch -thereof,- a normally-o 'en switch contact of-said cut-off relayfincln ed in said circuit for closure on actuation-of said relayfan off-normal contact' of'saidselective switch included in said circuit for; closure .on 1 initial movement of for finally ing circuit to restore sai windingzof said cut-off rela 7said circuit, and means opening said circuit on restoration of said switch.

effecting com letionof said lockselective switch, a also included in 57.- A telephone exchange system com- 7 I'prising a plurality of telephone lines, a; group of electrically o erated Indicators therefor, means controlle over the lines for closing the operating circuits of said indicators to durlng the disp ay of any one'indicator to prevent-the closing of the operatingcircuit of anyother indicator inthe group. 7

58. A telephone exchange system including a telephone line, link-circuits at theexchange, -a selective switch for said line for actuation to automaticall. select and conrelay-having with said. 'lme for actuation responsive to curxent'thereover ,to initiateatravel of said .fswitch', acut oflielay for. actuation on selectiofi mad to disconnect said" winding, a ,secofidzwindingforsaidline rela off-normal Iswitchicrjntacts'; ns under t 'e c( ntrol of for subsequently closed throu h'saidofinorrnaLswitch contacts, where ygsaid line a winding-normally in: circuit with said line overto initiate travel of said switch, a cut-o ti' itiate travel of said switch, at-l.

said switch,means controlled by the operator thew-:1 op'eratoryfoii -initiiiill energizing sald second winding-Hand a ho 'ding 'circuit thereaci fcuitxforclosure on initial movement of saidswitchymeans controlled by the operator v or automatically I cause their-display, and means operated.

nect' said line with an idle k-circuit, a line a winding normally in circuit stro in starting relay, and means for continuin relay is maintained. energized until said switch reaches normal. v

59. A telephone exchange system includ mg a telephone line, link-circuits at the exwhich it is restored after operation, a startmg relay for said mechanism normall controlled over said'line, a cut-oil relay or destro in said normal control, means control ed y said starting relay to restore said mechanism to normal, and operators means for operating said starting relay to bring about suchrestoration.

60. A telephone exchange system including a telephone line, link-circuits at the exchange, automatic switch -mech'anism for uniting said-line and an idle link-circuit, said mechanism having one normal position 'to which it is restored after operation, a starting relayfor said mechanism normal controlled over said line, a cut-off relay or desaid normal control, means control ed y said starting relay to restore said mechanism to normal, a circuit under operators control for initially actuating said it actuated until said mechanism reac es normal.

. 61. A telephone exchange system including a telephone line, link-circuits at the. ex-

change, automatic switch -mechanism for unitmgsaid line and' an idle link-circuit, a startin relay for said mechanism normally I control ed over said line, a cut-off relay for destroying said normal control, means con-- trolledib said starting relay to restore said mec anism to normal, acircuit under operatorY's control for initially actuati'n said starting relay and for maintaining 'sai cutoff relay operated, and meansforcompleting a subsequent circuit 'for said. relays and maintaining it until said mechanism reaches normal. v

.62. A telephone exchange system including a telephone'line, link-circuitsat the exchange, automatic switch mechanism for uniting said line and an idle link-circuit, a

starting relay for said mechanism normallycontrolled over said line, a cut-off relay for destroying said'normal control, means controlled by said starting relay to restore sald mechanism to normal, ofl-normal contacts on said switch mechanism, a circuit under operators control for initially actuating said starting relay, and means for closing'a subsequent circuit for said relay through said off-normal contacts, whereby said mechanism is kept operating until it reaches normal, whereu on it comes to.rest. t l

63. telephone exchange system including a telephone line, link-circuits atxthe exchange, automatic switch mechanism .for uniting said line and an idle linkscircuit, a

starting relay for said mechanism' normally controlled over said line, a cut ofrrelay for destroylng sald normal control, means con trolled by 'saidstarting relay to restore said mechanlsm'to normal, off-normal contacts on salcl swltchmechams'm, a circuit under operators control for initially actuating 'sald startmg relay and formaintaining said cut-off relay operated, and means for closing a subse uent circuit for said relays through said o -normal contacts, whereby said mechanism is kept operating until it reaches normaLWhereu on it comes to rest.

In witness w ereof, I. hereunto subscribe my name this 25th day of'July 1906.

HA RRY. G. WEBSTER. Witnesses:

Gno. E. MUELLER,

H. O. OLMSTEAD.

It is hereby certified that-in Letters Patent No. 931,904, granted August 2 4, 19( )9,

Corrett'lonln Letters Patent Nd. 931,904. n

upon the application of Harry G. Webster ,1 of Chicago, Illinois, for animprovement in Telephone Systems, an error appears in the printed specification requiring cormection. as follows: On page 3, lines 3-4,. and armature 39 of relay 40, sh0ulcl.be

stricken out and that the said Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the'Paten t Ofiice.

' Signedandsealed this sme l of Octob'er, A. 1)., 1909. Y I gs- 1 v o. o. BILLINGS,

' Acting ,Qmnmisaioner of stro in starting relay, and means for continuin relay is maintained. energized until said switch reaches normal. v

59. A telephone exchange system includ mg a telephone line, link-circuits at the exwhich it is restored after operation, a startmg relay for said mechanism normall controlled over said'line, a cut-oil relay or destro in said normal control, means control ed y said starting relay to restore said mechanism to normal, and operators means for operating said starting relay to bring about suchrestoration.

60. A telephone exchange system including a telephone line, link-circuits at the exchange, automatic switch -mech'anism for uniting said-line and an idle link-circuit, said mechanism having one normal position 'to which it is restored after operation, a starting relayfor said mechanism normal controlled over said line, a cut-off relay or desaid normal control, means control ed y said starting relay to restore said mechanism to normal, a circuit under operators control for initially actuating said it actuated until said mechanism reac es normal.

. 61. A telephone exchange system including a telephone line, link-circuits at the. ex-

change, automatic switch -mechanism for unitmgsaid line and' an idle link-circuit, a startin relay for said mechanism normally I control ed over said line, a cut-off relay for destroying said normal control, means con-- trolledib said starting relay to restore said mec anism to normal, acircuit under operatorY's control for initially actuati'n said starting relay and for maintaining 'sai cutoff relay operated, and meansforcompleting a subsequent circuit 'for said. relays and maintaining it until said mechanism reaches normal. v

.62. A telephone exchange system including a telephone'line, link-circuitsat the exchange, automatic switch mechanism for uniting said line and an idle link-circuit, a

starting relay for said mechanism normallycontrolled over said line, a cut-off relay for destroying said'normal control, means controlled by said starting relay to restore sald mechanism to normal, ofl-normal contacts on said switch mechanism, a circuit under operators control for initially actuating said starting relay, and means for closing'a subsequent circuit for said relay through said off-normal contacts, whereby said mechanism is kept operating until it reaches normal, whereu on it comes to.rest. t l

63. telephone exchange system including a telephone line, link-circuits atxthe exchange, automatic switch mechanism .for uniting said line and an idle linkscircuit, a

starting relay for said mechanism' normally controlled over said line, a cut ofrrelay for destroylng sald normal control, means con trolled by 'saidstarting relay to restore said mechanlsm'to normal, off-normal contacts on salcl swltchmechams'm, a circuit under operators control for initially actuating 'sald startmg relay and formaintaining said cut-off relay operated, and means for closing a subse uent circuit for said relays through said o -normal contacts, whereby said mechanism is kept operating until it reaches normaLWhereu on it comes to rest.

In witness w ereof, I. hereunto subscribe my name this 25th day of'July 1906.

HA RRY. G. WEBSTER. Witnesses:

Gno. E. MUELLER,

H. O. OLMSTEAD.

It is hereby certified that-in Letters Patent No. 931,904, granted August 2 4, 19( )9,

Corrett'lonln Letters Patent Nd. 931,904. n

upon the application of Harry G. Webster ,1 of Chicago, Illinois, for animprovement in Telephone Systems, an error appears in the printed specification requiring cormection. as follows: On page 3, lines 3-4,. and armature 39 of relay 40, sh0ulcl.be

stricken out and that the said Letters Patent should be read with this correction therein that thesame may conform to the record of the case in the'Paten t Ofiice.

' Signedandsealed this sme l of Octob'er, A. 1)., 1909. Y I gs- 1 v o. o. BILLINGS,

' Acting ,Qmnmisaioner of Correction in Letters Patent No. 931,904.

f It is herqby certified tllabin Letters l upon the application of Harry Webster, I in Telephone Systems,

rection. as follows: On page 3, lines 3-4,

an error appears in the Patent No. 931.904, granted August 24, 1909,

of Chicagq, Illinois, for an improvement printed specification requiring cor and armature 39 of relay 40, should be Signed and sealed this 5th day of Octoblar, A. D., 1909.

[SEAL] C. (I. BILLINGS, Acting Commissioner of Patents.

DISCLAIMER- 931,904.-Ham*y G. TELEPHONE SYSTEM. Patent dated August 2-l, 1909.

Webster, Chicago, Ill.

Disclaimer filed March 8, 1915, by KeZZogg Switchboard and Supply Company, assignee, by mesne assignments.

Enters its disclaimer To the claims of the patent, which read as follows, to wit:

33. A telephone exchange system comprising a plurality of telephone lines, a plurality of associated link-circuits, automatic switching means for establishing connection between a calling line and an idle link-circuit a pair of relays associated with the answering end of each link-circuit, and means whereby the energization of one of said relays is dependent upon the operative condition of the other.

34. A telephone exchange system comprising a plurality of telephone lines, a plurality of associated link-circuits, automatic switching means for establishing connection between a calling line and an idle link-circuit a pair of relays associated with the answering end of each link-circuit, one of said relays being under the control of a calling party when its link-circuit is connected to the calling line, and means whereby the eneirgization of the other of said relays is dependent upon the condition of the rst re ay.

[Oficial Gazette, March 16, 1915.] 

